Brake mechanism.



y T. 1. DUFFY. BRAKE MBGHANISM.

APPLICATION FILED 00T. 28, 1912.

l,76,563 Patented 1101.211913. 91,

llllllll-Il Illlll4 Mgg.

entren THOMAS I. nnrrr, or omesso, rLLrNors, assiettes. ro n. c. seizes so., or' omesso,

rnnuoirs, a componenten or immers.

snake iunenan'rssr tipeciicaton of Letters atent.

Patented @ein 2f, 1%13.

application sied october ze, raie. semi no. 728,21*?.

To all whom t may concern.'

Be it known that l, THOMAS i. Burri', a citizen of the United States, and a resident of Chicago, in the county of ACoeli and State of Illinois, have invented certain new and useful Improvements in Brake Mechanism; and 1' do hereby declare that the following is a full, clear, and exact description thereof,y reference' being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specication.

rlhis invention relates to improvements in brake mechanism for motor vehicles and for analogous uses, and refers more speciiically to internal brakes., wherein the brake band is located or contained within the drum carried by the vehicle wheel or other movable part and is provided with means for expanding the band outwardly into contact with the internal braking surface of 'the drum.

Among the objects of the invention is 'to improve and simplify bra-lie mechanisms of this general character, and the invention consists in the matters hereinafter set forth and more particularly pointed out in the appended claims.

In the drawings Figure l is a view partly in elevation and partly in section of a motor vehicle rear axle and wheelv provided with a brake mechanism embodying my invention. Fig. 2 is a section on the indirect line 2 2 of Fig. 1. F ig. 3 is a detail section on the indirect line 3-3 of Fig. 2. Fig. 4 is a perspective view of the angularly movable expander cams for expanding the brake bands. v

As shown in the drawings, 10 designates the rear axle' casing or housing that is formed vwith a chamber 11. to receive the anti-friction bearings between the driving shaft and the aXle housing. The axle shown is of the semi-Heating type, the driving shaft spindle carrying the wheel hub 12 exterior' to the anti-friction hearings. it will be understood, however, that my improved brake mechanism may be applied to other' forms of axles. y Y

L4 designates a brake drum that is -attaehed as by means of the bolts 15,- 15 to thev hub 12 and is provided with the usual cylindrie dang/e 16 concentric with the driving shaft and which extends inwardly from the hub. The inner surface 17 of the drum constitutes a braking surface adapted for engagement with brake bands contained within said drum;

18, 19 designatev brake bands Within the drum, arranged one at the side of the other, and each adapted to operate against the inner braking surface of the drum. The said brake bands are provided at their exterior sides with the usual fabric or other friction faces 20,- 21 adapted for direct Contact with the interior' braking face of the drum. The bands are provided intermediate their ends with loops or eyes 24, 25 through which extends an anchoring stud 2G that hasbearing in a boss 27 of a torque arm 28 that is attached, as by means of bolts 29, to a flange 30 on the arde casing or housing 10. The ends of said brake bands at the open sides thereof are provided with lugs or fittings 3l, 32 which are secured, as by means'of the rivets 33, to the ends of the bands. The said lugs 8l, 32 each comprises a curved base portion 34 that lies against and is attached to its band, an inwardly turned portion 35 and ribs 36, 3G connecting the base portion with the inwardly turned portions. The inwardly turned portions or fianges 35 of the lugs attached to the opposite ends of each band lie parallel with each other and are smooth on their inner or adjacent faces. @ne of the bands is shown as longer than the other band and the lugs of one pair are, therefore, spaced closer than those of the other pair. rllhis construction provides a maximum braking Contact and is made practicable by the operating devices hereinafter described.

lThe brake bands are adaptecly to be expanded outwardly into their braking positions by means of expander members or cams 3S, 39, of rectangular cross section, arranged one between each pair of lugs. The expander member or' cam 38 is formed upon or constitutes an enlargement of a rook shaft 40., while the expander member or cam 39 is formed upon or constitutes an enlargementof a tubular rock shaft il that surrounds and constitutes the bearing for the rock sha-ft li0; said tubular rock shaft being in turn mounted to rock in a boss or sleeve '43 formed en the adjhcent end of the torque 'ios arm 2 rllhe said solid rock shaft t0 is angularly movable on its axis relatively to and indeijlendently of the tubular rock shaiit ll-l. and said rock shafts are adapted to be so an.

gularly operated by means of crank arms if),

4:6 attached thereto. Said cranlr arms are adapted 'for vconnection in any suitable inanner With forwardly extending operating' connections, not shown. Each pair of said legs 10 at the ends of' the bralre bands is held up against its cooperating expanding` member or cam by means ot'spring devices which serve to close or contract the brake bands when braking pressure' is released and also u, to hold the parts together and prevent them from rattlino'. As herein shown, 'these spring,` devices have the form of Q-shaped springs 50, 5l, the ends of which engage .into notches 52 formed on the exterior sides ol 29 `the flanges 35. 'When the rock shafts l0 and Lll are turned on their aresi the said es;i pander members or cams are regularly displaced and, by reason of their rectangular cross section, spread or force the lugs apart,

with theresnlt of expanding the brake bands 30 shafts, as the solid rock shaft el), is erigir larly turned to angnlarly displace the er.- pander member or cam 38 to thereby expand its coperating brake band. ll it be desired to apply an emergency stop or brake7 both rock shafts will be angular-ly turned simultaneously so as to throw both pairs ot' brake bands connected thereto outwardly in their braking positions.

ln order to provide a reliable and durable 4o connection between the brake bands and their expander lugs or ittings, and to avoid shearing stress being brought upon the r1vets 33 that connect the hiss to said brake bands said lu s are provided with short lips 55 which are fitted against the en l edges of 'the bralre bands, as more clearly in dicated in Fig. 2. `W ith this construction, when said fittings are pressed outwardly by the expander members or cams7 the enpansive force is transmitted through said lips. Therefore, the only duty imposed upon the said rivets 33 is that ot'holding said lugs or fittings on the bands.

ln order to hold the brake bands in place Within the drums when in their non-braking positions vand prevent the parts from rat tling, l may interpose yielding means or cushions between the anchor studs 26 and theclosed parts of the loops or eyes let,

@G As herein shown, the said anchor studs are provided with recesses or soclrets to receive coiled expansion springs 5G which bear eigainst the bottoms of the recesses or socleets, and said closed parts ofthe loops or eyes Q4, 2?. When the brake bands are expanded they are expanded against the action et said springs 56.

lf desired the brake bands may be split or diviccd in. the manner shown in pending application for U. El. lLetters Patent, Serial No. 723,216 tiled ot even date herewith, in order to enable the pressure ot said bands to be eqnalized transversely across the brak in@1 lace of the drinn.

lf claii'n as my invention l. An internal brake mechanism for vehicles comprising, in combination 1with brake drinn having)` an internal braking "face, 'tivo transversely split braise bands therein, arranged side by side each band consistinjfgI or. a continuons band split at one point only and the split point oit both ban 'is coinciding, lugs attached to the endsoi the said bands, and provided with parallel, opposing" faces, axially :dined expander members ol? oblongr cross section between said lugs, means for separately roclring'the said. expander meinn bers7 a lined anchor stud1 the bands being provided with loops tc tit over said. sind, and springs between said and. said loops.

2. ein internal brake mechanism for vehicles comprising7 in combination with a brake drinn havingan internal braking' tace,

two 'transversely split brake bands thereing arranged side by side, lugs attached to the ends et said bands7 and provided with par allel7 opposiiig faces and on their inner 'faces with notches, axially alined expander ineinbers oit oblong cross section'beiveen said lugs7 means for separately rockingsaid enl ponder members and C-shaped springs en @paging over said lugs with the ends ,thereof biting into said notches to hold the lugs aid expander members.

fi iiiternal brake mechanism to tor vehicles conipri lig, in combination a brake drninliaving an internal braini tace, a transversely split brake band therein.7 lugs attached to the ends oi." said band and provided with opposing parallel races, a rocking expander'member ot oblong cross section between and acting on the inner faces ofl said lngs,ivith means to roclr the saine, and @shaped spring embracing said ingsn the lugs beingl provided on 'their sides opposite to the expander member entacos with notches to receive the ends ol said sprin'f.

Il. An internal bralre n'iechanisin for inotor vehicles comprisinga in combination with bralre drum provided with an internal braking face, a transversely split brake band therein7 ings attached to the ends of said band and provided with opposingn parallel faces, rocking expander member lot' ole-- long; cross section between and acting on saidinces` of the lugs, with means "tor roel.- ing the saine, and yielding` means tor holding the lugs pressed against said expander member, said lfu, s beirig riveted to the presence of two Witnesses, this 18th day of brake band, and eing provided with lips October, A. D. 191.2.

which overlap the end margins of the brake THOMAS I. DUFFY. bar id, for the' purpose set forth. Vitnessesz 5 In testimony, that I claim the? foregoing W. L. HALL,

as my invention I aix my signature in the G. E. DOWLE. 

